Test beam performance of sensor modules for the CMS Barrel Timing Layer

The minimum ionizing particles (MIPs) timing detector (MTD) will be installed during the Phase II Upgrade of the Compact Muon Solenoid (CMS) experiment at the CERN LHC. The MTD will provide time information for tracks with a time resolution of about 30-60 ps to handle the increased number of concurrent interactions and maintain the CMS detector's reconstruction performance. The barrel part of the detector (BTL) is instrumented with sensor modules made of 16 bars of cerium-doped lutetium-yttrium oxyorthosilicate (LYSO:Ce) scintillating crystals coupled at each end to silicon photomultipliers (SiPMs). The SiPMs will be exposed to an unprecedented radiation level by the end of the High-Luminosity LHC operations, up to a neutron fluence of $2 \times 10^{14}$ 1 MeV n$_{\textrm{eq}}/\textrm{cm}^{2}$. The latest results of test beam campaigns conducted at CERN and FNAL during 2023 will be presented, demonstrating that the performances of non irradiated and irradiated final sensor modules are within the BTL design requirements.